using System;

public class Program

{

    public static void Main()

    {

        //input

        double test1= 78;

        double test2 = 89;

        double final = 90;

        //calc

        double overallGrade = .3 * test1 + .3 * test2 + .4 * final;

        Console.WriteLine("Overall grade is {0}", overallGrade.ToString("F3"));

    }

}